From 1978 and on the brake system of the Mini evolved to the point that this modern proportioning valve became stock. This valve is critical to maintain the proper balance between the front and rear brakes. Too much front brakes can lead the car to push in a corner, while too much rear brake could cause the back of the car to swing out under hard braking!

From 1978 and on the brake system of the Mini evolved to the point that this modern proportioning valve became stock. This valve is critical to maintain the proper balance between the front and rear brakes. Too much front brakes can lead the car to push in a corner, while too much rear brake could cause the back of the car to swing out under hard braking!

The other 4-way valve on the bulkhead on later cars (part number FAM7821) is frequently wrongly identified as one of the above as they are similar. However, this unit does not have the electrical connection, and has a cylinder sticking out one end. This IS a brake pressure regulator, only fitted to front/rear split systems as far as I'm aware. The PDWA is built into the master cylinders in these applications.